The electrical conductivity measuring principle is introduced based on its physical meaning.The low-power microcontroller MSP430 and wireless communication chip nRF905 are taken as the core chips of the hardware.The automatic range switching circuit and temperature compensation circuit are designed to improve the measurement precision.The energizing pulse generator

range switching

data processing

local display and the communication module controlling are all realized with the software.Experimental results show that the measurement precision of analyzer is better than 1 % and is suitable for most industrial monitoring application and 320 meters wireless transmission can be realized in open area.